first off, V = 60 is wrong, its 20.
well, if velocity is constant and money supply is constant, then we have;
20 = P*Y / 600, so P*Y = 3 * 4,000 . Y goes up by 10% (given in question) so P*4,400 = 12,000 so P = 12,000/4,400 = 2.7272
so price goes down and nominal GDP stays constant.
b) since 20 = P*Y/M and Y goes up, P stays constant we have 20 = 3*4,400/M so just rearrange.
c) 20 = 3.3*4,400/M again just rearrange.